What kind of judgement calls are more likely to be useful in an accident situation?
1. Solving hard ethical dilemmas, such as swirving to avoid a baby carriage at the cost of running over an elderly person.
2. Out-of-the-box ingenuity, such as ramping off of the guard rail and balancing on two wheels to avoid the accident.
3. Stomping on the brakes as early as possible.
Human judgement definitely excels at 1 and 2, but in all honesty, I think 3 is the most practical. It also happens to be the one a computer would be best at.
If you exchange the 1 second human reaction time for a 1ms computer reaction time, you will go about 18km/h (11mph) slower when you hit something, dramatically increasing your and their chances of survival.
Obviously I know that you personally would be able to deftly maneuver to avoid the accident and that you'd react way faster than 1 second because you're always alert and a better than average driver (and it's not illusory superiority, because you'd have to be an idiot to believe you're good when you're average).
However, you're just one incredibly good driver, while there are a hundred million average ones. Statistically, it makes way more sense to opt for the 11mph reduction in impact speed.